Study on an ozone episode in hot season in Hong Kong and transboundary air pollution over Pearl River Delta region of China

Lam, Ka Se; Wang, T.J.; Wu, Cheng; Li, Y.S.

doi:10.1016/j.atmosenv.2004.11.023

Cited by 127 publications

(65 citation statements)

References 10 publications

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“…Ding et al, 2004;Lam et al, 2005;Wang et al, 2006;Huang et al, 2006). These studies suggested the importance of regional transport from the inland PRD region.…”

Section: Introductionmentioning

confidence: 94%

“…Huang et al (2006 surveyed 54 O 3 episodes that occurred over Hong Kong during [2000][2001][2002][2003][2004] and found that O 3 episodes were dominated by regional transport when a tropical cyclone/typhoon was located over the Northwestern Pacific or the South China Sea to the east or southeast and when an anticyclone appeared over mainland China to the north. Sensitivity studies even revealed that, in some O 3 episodes, 40-90% of the ambient O 3 at urban and rural areas of Hong Kong was attributed to horizontal transport (Lam et al, 2005;Wang et al, 2006). However, all of these studies were carried out within Hong Kong.…”

Section: Introductionmentioning

confidence: 99%

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Concurrent observations of air pollutants at two sites in the Pearl River Delta and the implication of regional transport

et al. 2009

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Abstract. An intensive field measurement study was conducted simultaneously at a site within the inland Pearl River Delta (PRD) region (WQS) and a site in Hong Kong (TC) between 22 October and 1 December 2007. Ambient air pollutants measured included O 3 , NO x , CO, SO 2 , NMHCs, and carbonyls. The purpose is to improve our understanding of the interplay among local and regional air pollutants in the Hong Kong area, and the influence of regional transport on local air pollutants. The results indicate that the mean levels of air pollutants at the WQS site were much higher than those at the TC site, except NO x . Thirteen O 3 episode days (daily O 3 peak in excess of 122 ppbv) were monitored at WQS during the study period, while only 2 days were recorded at TC. Diurnal variations of O 3 showed higher nighttime levels of O 3 at TC than at WQS as well as more photochemical activity at WQS than TC. Remarkable differences in diurnal variations were also found between high and low O 3 pollution days at each site, implying that Hong Kong is more acutely VOC-limited than the inland PRD region. Ratio analyses for trace gases and VOCs and back trajectory calculation revealed that the air masses arriving at WQS were more aged due to regional influence, whereas the air masses at TC were mainly affected by local emissions and/or regional transport. In addition, the influence of regional transport from Eastern China on the primary pollutants of Hong Kong was noticeable, whereas the air masses from the inland PRD region (e.g. Dongguan and Huizhou) had significant influence on the air pollutants at WQS, and the anthropogenic emissions Correspondence to: H. Guo (ceguohai@polyu.edu.hk) in Eastern PRD (e.g. Shenzhen) played an important role on the photochemical ozone pollution in Western Hong Kong. These results confirm that regional and sub-regional transport of air pollution has a complex and significant impact on local air pollutants in this region.

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“…Ding et al, 2004;Lam et al, 2005;Wang et al, 2006;Huang et al, 2006). These studies suggested the importance of regional transport from the inland PRD region.…”

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Concurrent observations of air pollutants at two sites in the Pearl River Delta and the implication of regional transport

et al. 2009

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“…Fine particulate matter (PM) has been measured at levels nearly double the U.S. National Ambient Air Quality Standard (NAAQS) (4), and it is responsible for visibility that at times can be a few kilometers (5). Ozone concentrations are often above U.S. and Hong Kong air quality standards, with hourly average concentrations of as much as 330 ppbv during specific episodes (5,6). On the streets of Hong Kong, monthly average NO 2 and PM10 concentrations >100 µg m -3 have been measured (7).…”

Section: Introductionmentioning

confidence: 99%

Modeling Study of Air Pollution Due to the Manufacture of Export Goods in China's Pearl River Delta

Streets

Bergin

et al. 2006

Environ. Sci. Technol.

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The Pearl River Delta is a major manufacturing region on the south coast of China that produces more than $100 billion of goods annually for export to North America, Europe, and other parts of Asia. Considerable air pollution is caused by the manufacturing industries themselves and by the power plants, trucks, and ships that support them. We estimate that 10-40% of emissions of primary SO 2 , NO x , RSP, and VOC in the region are caused by exportrelated activities. Using the STEM-2K1 atmospheric transport model, we estimate that these emissions contribute 5-30% of the ambient concentrations of SO 2 , NO x , NO z , and VOC in the region. One reason that the exported goods are cheap and therefore attractive to consumers in developed countries is that emission controls are lacking or of low performance. We estimate that state-of-theart controls could be installed at an annualized cost of $0.3-3 billion, representing 0.3-3% of the value of the goods produced. We conclude that mitigation measures could be adopted without seriously affecting the prices of exported goods and would achieve considerable human health and other benefits in the form of reduced air pollutant concentrations in densely populated urban areas.

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“…While there are still nonattainment areas for ozone in developed countries like the USA (Hakami et al, 2006), in the developing world ozone pollution is becoming an air quality issue of increasing concern, particularly in megacities and their downwind regions (Beig and Singh, 2007;Kulkarni et al, 2010;Lal et al, 2012). In south China's Pearl River Delta region, for example, observed ambient ozone levels frequently exceeded the guideline level of 200 µg/m 3 or 102 ppbv (1-h average; GB 3095-2012) Lam et al, 2005;Zheng et al, 2010), and even background ozone levels have increased steadily in recent years (Chan et al, 2003;Wang et al, 2009). Developing ozone control strategies is very difficult since ozone does not respond in a proportional manner to reductions in the precursor emissions (Finlayson-Pitts and Pitts, 1999).…”

Section: Introductionmentioning

confidence: 99%

Sources of C2–C4 alkenes, the most important ozone nonmethane hydrocarbon precursors in the Pearl River Delta region

Zhang

Wang

Zhang

et al. 2015

Science of The Total Environment

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Study on an ozone episode in hot season in Hong Kong and transboundary air pollution over Pearl River Delta region of China

Cited by 127 publications

References 10 publications

Concurrent observations of air pollutants at two sites in the Pearl River Delta and the implication of regional transport

Concurrent observations of air pollutants at two sites in the Pearl River Delta and the implication of regional transport

Modeling Study of Air Pollution Due to the Manufacture of Export Goods in China's Pearl River Delta

Sources of C2–C4 alkenes, the most important ozone nonmethane hydrocarbon precursors in the Pearl River Delta region

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